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Question

During transcription in eukaryotes, RNA polymerase II synthesizes


A

precursors of tRNA and snRNA

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B

precursors of mRNA, snRNA and microRNA

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C

precursors of rRNA

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D

all of the above

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Solution

The correct option is B

precursors of mRNA, snRNA and microRNA


The correct option is B.

Explanation of correct option:

  1. Only one form of an RNA transcript, pre-ribosomal RNA (or pre-rRNA), is synthesized by RNA polymerase I (pol I).
  2. It acts as a precursor for the 18S, 5.8S, and 28S rRNAs.
  3. RNA polymerase II (Pol II) is a catalytic enzyme that catalyzes the production of mRNAs and other specialized RNAs.
  4. RNA polymerase III (Pol III) is responsible for the production of tRNAs, 5S rRNA, and a few other short specialized RNAs.
  5. All three forms of RNAs are synthesized by a single type of RNA polymerase in prokaryotes (tRNA, rRNA, and mRNA).

Final answer: During transcription in eukaryotes RNA polymerase II synthesized precursors of mRNA, snRNA, and microRNA.


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